[Network Beaconing Identification] Update beaconing docs to add feature details of the transform

[sodhikirti07]

What I did in this PR

Updated the README to add feature details and customizations from this HTML page. The HTML will be deleted after this PR is merged.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Screenshots

Screenshots are in the comment section

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• Start Time: 2023-11-20T16:05:16.475+0000

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[qn895]

Out of curiosity, does this transform ever need unattended setting?

https://www.elastic.co/guide/en/elasticsearch/reference/current/put-transform.html

(Optional, boolean) If true, the transform runs in unattended mode. In unattended mode, the transform retries indefinitely in case of an error which means the transform never fails. Setting the number of retries other than infinite fails in validation. Defaults to false.

[susan-shu-c]

Hi @qn895 we are looking into adding that flag for beaconing, but not just yet as we want to see how it's faring on LMD; https://github.com/elastic/security-team/issues/7922#issuecomment-1812819516

I think as soon as the ES change you linked has gone out then it should be safe to update

[sodhikirti07]

README screenshots:

[elasticmachine]

Package beaconing - 1.1.0 containing this change is available at https://epr.elastic.co/search?package=beaconing